Acid Sulphate Investigation · OPW19/0098

METHOD OF SOIL DESCRIPTION
y, Golder os USED ON BOREHOLE AND TEST PIT REPORTS

GRAPHIC LOG - TYPICAL SYMBOLS FOR SOILS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ri |---| CLAY (CL, Cl OR CH)
7 Ti
eo “= ©] ORGANIC SOILS
|°.o °c] GRAVEL (GP OR GW) |. « {(OLOR OHOR Pt)
. pV
72] SAND (SP OR SW) [ee] COBBLES OR BOULDERS

 

 

 

} * « “SILT (ML.OR MH)

 

 

 

Combinations of these basic symbols may be used to indicate mixed materials such as sandy clay.

 

CLASSIFICATION AND INFERRED STRATIGRAPHY \

Soil and Rock is classified and described in Reports of Boreholes and Test Pits using the preferred method given in
AS1726 - 1993, Appendix A. The material properties are assessed in the field by visual/tactile methods.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Particle Size Plasticity Properties
Major Division {Sub Division |Particle Size 40
BOULDERS > 200 mm om
COBBLES f63 to 200 mm weaum | day
Coarse 20 to 63 mm zs” a cay
x Low plastcty
GRAVEL Medium 6.0 to 20 mm g oy
Fine 2.0 to 6.0 mm 57 - ahi
§ . mit sift
Coarse 10.6 to 2.0 mm =
SAND Medium 0.2 to 0.6 mm = 10 LD” seat
Fine 0.075 to 0.2mm [eet Gaysa ‘men
Mt - Low fauid Emit sit
SILT 10,002 to 0.075 mm 0
0 10 20 30 40 50 60 70 80
CLAY < 0.002 mm Liquid Limit (%)
MOISTURE CONDITION AS1726 - 1993
Symbol Term Description
D Dry _ Sands and gravels are free flowing. Clays & Silts may be brittle or friable and powdery.
M Moist Soils are darker than in the dry condition & may feel cool. Sands and gravels tend to cohere.
Ww Wet Soils exude free water. Sands and gravels tend to cohere.
CONSISTENCY AND DENSITY AS1726 - 1993
Symbol Term Undrained Shear Symbol Term Density Index % SPT “N" 4
Strength :
VS Very Soft Oto 12kPa VL Very Loose Less than 15 Oto 4
Soft 12 to 25 kPa L Loose _ 18t0 35 4to10
F Firm 25 to 50 kPa MD | Medium Dense 35 to 65 10 to 30
St Stiff 50 to 100 kPa D Dense 65 to 85 30 to 50
vst Very Stiff 100 to 200 kPa VD Very Dense above 85 Above 50
H Hard above 200 kPa

 

 

 

 

 

 

 

 

 

 

# SPT correlations are not stated in AS1726 — 1993, and may be subject to corrections for overburden pressure and
equipment type.

in the absence of test results, consistency and density may be assessed from correlations with the observed behaviour
of the material.

 

 

 

GAP Form No. 5
RL4